HttpWebRequest Login

public class Http
    {
        public string PostRequest(string host, string path, string spostPacket)
        {
            var cookies = Cookies.GetInstance();
            var cookieContainer = new CookieContainer();
            
            byte[] postPacket = Encoding.UTF8.GetBytes(spostPacket);

            var request = (HttpWebRequest) HttpWebRequest.Create("http://" + host + path);
            request.CookieContainer = cookieContainer;
            request.Method = "POST";
            request.Host = host;
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1";
            request.ConnectionGroupName = "keep-alive";

            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = postPacket.Length;
            request.Proxy = new WebProxy();
            foreach (var cookie in cookies.GetCookies())
            {
                request.CookieContainer.Add(cookie);
            }
            
            
            

            var dataStream = request.GetRequestStream();


            dataStream.Write(postPacket, 0, postPacket.Length);
            var response = (HttpWebResponse)request.GetResponse();
            var responseType = response.ContentType;
            dataStream = response.GetResponseStream();
            var responseStream = new StreamReader(dataStream);
            var html = responseStream.ReadToEnd();
            if(response.Cookies.Count != 0)
            {
                List<Cookie> retCookie = new List<Cookie>();
                for (int i = 0; i < response.Cookies.Count; i++)
                {
                    retCookie.Add(response.Cookies[i]);
                }
                cookies.SetCookies(retCookie);
            }
           dataStream.Close();
           return html;
        }




        public string GetRequest(string host, string path = "")
        {
            var cookies = Cookies.GetInstance();
            var cookieContainer = new CookieContainer();

            var request = (HttpWebRequest)WebRequest.Create("http://" + host + path);
            request.CookieContainer = cookieContainer;
            request.Method = "GET";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ConnectionGroupName = "keep-alive";
            request.Host = host;
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1";
            request.Proxy = new WebProxy();
            
            foreach (var cookie in cookies.GetCookies())
            {
                request.CookieContainer.Add(cookie);
            }

            var response = (HttpWebResponse)request.GetResponse();
            
            var dataStream = response.GetResponseStream();
            var responseStream = new StreamReader(dataStream);
            var html = responseStream.ReadToEnd();
            if (response.Cookies.Count != 0)
            {
                List<Cookie> retCookie = new List<Cookie>();
                for (int i = 0; i < response.Cookies.Count; i++)
                {
                    retCookie.Add(response.Cookies[i]);
                }
                cookies.SetCookies(retCookie);
            }
            dataStream.Close();
            return html;
        }
    }

 public class Cookies
    {
        private List<Cookie> _cookies = new List<Cookie>();
        private static Cookies _cookiesInstance;


        public static Cookies GetInstance()
        {
           if (_cookiesInstance != null)
                return _cookiesInstance;
            _cookiesInstance = new Cookies();
           return _cookiesInstance;
        }

        private Cookies(){}

        public List<Cookie> GetCookies()
        {
            return _cookies;
        }
        public void SetCookies(List<Cookie> cookies )
        {
            _cookies = cookies;
        }
    }





    public class CookieEntity
    {
        public Cookie cookie { get; set; }
    }

var httpRequest = new Http();
            var html = string.Empty;
            html = httpRequest.GetRequest(@"www.elitepvpers.com");
            html = httpRequest.PostRequest(@"www.elitepvpers.com", "/forum/login.php?do=login", @"vb_login_username=" + usrName + @"&vb_login_password=&cookieuser=1&s=&securitytoken=" + "guest" + "&do=login&vb_login_md5password="+ GetMd5Hash(password).ToLower() +"&vb_login_md5password_utf=" + GetMd5Hash(password).ToLower());

            Cookies.GetInstance().GetCookies().Contains("COOKIEDASEXISTIERENMUSSWENNDUEINGELOOGTBIST")

public Elitepvpers(string username, string password)
        {
            Request request = new Request();
            string serverResponse = null;

            username = HttpUtility.UrlEncode(username);

            request.Send("http://elitepvpers.com/forum", ref cookies);
            serverResponse = request.Send("http://www.elitepvpers.com/forum/login.php?do=login", "vb_login_username=" + username + "&vb_login_password=" + password + "&cookieuser=1&s=&securitytoken=guest&do=login&vb_login_md5password=&vb_login_md5password_utf=", ref cookies);

            if (!serverResponse.Contains("Thank you for logging in")) loggedIn = false;
            else loggedIn = true;
        }

username = HttpUtility.UrlEncode(username);